84857797 has 2 divisors, whose sum is σ = 84857798. Its totient is φ = 84857796.

The previous prime is 84857783. The next prime is 84857807. The reversal of 84857797 is 79775848.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84621601 + 236196 = 9199^2 + 486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84857797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84857737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42428898 + 42428899.

It is an arithmetic number, because the mean of its divisors is an integer number (42428899).

Almost surely, 2^84857797 is an apocalyptic number.

It is an amenable number.

84857797 is a deficient number, since it is larger than the sum of its proper divisors (1).

84857797 is an equidigital number, since it uses as much as digits as its factorization.

84857797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3951360, while the sum is 55.

The square root of 84857797 is about 9211.8291886031. The cubic root of 84857797 is about 439.4376372683.

The spelling of 84857797 in words is "eighty-four million, eight hundred fifty-seven thousand, seven hundred ninety-seven".